麻烦老师帮我改一下，一头雾水
package com.imooc.domain;
public class Food {
private String id;
private String name;
private String taste;
private String path;
private String price;
private String describe;
public Food() {
}
public Food(String id, String name, String taste, String path,String price, String describe) {
super();
this.id = id;
this.name = name;
this.taste = taste;
this.path = path;
this.price = price;
this.describe = describe;
}
/**
* @return the id
*/
public String getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(String id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the taste
*/
public String getTaste() {
return taste;
}
/**
* @param taste the taste to set
*/
public void setTaste(String taste) {
this.taste = taste;
}
/**
* @return the path
*/
public String getPath() {
return path;
}
/**
* @param path the path to set
*/
public void setPath(String path) {
this.path = path;
}
/**
* @return the price
*/
public String getPrice() {
return price;
}
/**
* @param price the price to set
*/
public void setPrice(String price) {
this.price=price;
}
/**
* @return the describe
*/
public String getDescribe() {
return describe;
}
/**
* @param describe the describe to set
*/
public void setDescribe(String describe) {
this.describe = describe;
}
@Override
public String toString() {
return "Food [id=" + id + ", name=" + name + ", taste=" + taste + ", path=" + path + ", price=" + price
+ ", describe=" + describe + "]";
}
}
package com.imooc.domain;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
//菜品数据处理
public class FoodDaoImpl {
//存放菜品信息的列表
private static final List<Food> db=new ArrayList<Food>();
private String msg;
/**
* @param msg the msg to set
*/
public void setMsg(String msg) {
this.msg = msg;
}
/**
* @return the msg
*/
public String getMsg() {
return msg;
}
/**
* @return the db
*/
public static List<Food> getDb() {
return db;
}
//添加菜品
public void addFood(Food food) {
db.add(food);
}
//查询所有菜品信息
public List<Food> getAllFood(){
if(db.isEmpty()) {
System.out.println("菜单是空的");
return null;
}else {
return db;
}
}
//根据菜名查询菜品信息
public Food getFoodByName(String foodName) {
Food food=new Food();
for(int i=0;i<db.size();i++) {
if(db.get(i).getName().equals(foodName)) {
food=db.get(i);
break;
}
}
return food;
}
//根据菜品id查询菜品信息
public Food getFoodById(String id) {
Food food=new Food();
for(int i=0;i<db.size();i++) {
if(db.get(i).getId().equals(id)) {
food=db.get(i);
break;
}
}
return food;
}
//菜品修改
public void updateFood(Food newFood) {
for(int i=0;i<db.size();i++) {
if(db.get(i).getId().equals(newFood.getId())) {
db.remove(i);
db.add(newFood);
System.out.println("菜品以更新完成！");
break;//跳出循环
}
}
}
//根据菜品id进行删除
public void deleteFoodById(String id) {
if(db.isEmpty()) {
System.out.println("菜单是空的！");
return;//return使整个函数返回，后面的不管是循环里面还是循环外面的都不执行
}else {
for(int i=0;i<db.size();i++) {
if(db.get(i).getId().equals(id)) {
db.remove(i);
break;
}
}
}
}
}
package com.imooc.servlet;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.imooc.domain.Food;
import com.imooc.domain.FoodDaoImpl;
import com.imooc.util.UploadUtils;
/**
* 添加菜品Servlet implementation class FoodAddServlet
*/
public class FoodAddServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
FoodDaoImpl FoodDaoImpl1 = (FoodDaoImpl) this.getServletContext().getAttribute("FoodDaoImpl");
List<Food> foodList = (List<Food>) this.getServletContext().getAttribute("foodlist");
if (foodList.isEmpty()) {
System.out.println("从servletContext中获得的集合是空的");
}
// 定义一个Map集合用于保存接收到的数据
Map<String, String> map = new HashMap<String, String>();
try {
// 创建一个磁盘文件项工厂对象
DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
// 2创建一个核心的解析类
ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);
// 3、解析request请求，返回List集合，集合中存放的是FileItem对象
List<FileItem> list=servletFileUpload.parseRequest(request);
// 4.遍历list，查看传递过来的数据是什么
String url=null;
for(FileItem fileItem:list) {
if(fileItem.isFormField()) {
//普通表单项
//接收表单项参数的值
String name=fileItem.getFieldName();
String value=fileItem.getString("UTF-8");
//存放在map中
map.put(name, value);
}else {
//文件上传项
//获得文件上传的名称
String fileName=fileItem.getName();
if(fileName!=null&&"".equals(fileName)) {
//通过工具类获得唯一文件名
String uuidFileName=UploadUtils.getUUIDFileName(fileName);
//获得文件上传的数据
InputStream is=fileItem.getInputStream();
//获得文件上传的路径
String path=this.getServletContext().getRealPath("/upload");
//将输入流对接到输出流
url=path+"\\"+uuidFileName;
OutputStream os=new FileOutputStream(url);
int len=0;
byte[] b=new byte[1024];
while((len=is.read(b))!=-1) {
os.write(b,0,len);
}
is.close();
os.close();
}
}
}
if(foodList==null) {
System.out.println("从ContextServlet中获得的菜单是空的");
if(foodList!=null) {
//检验网页上添加的菜名是否存在
for(Food food:foodList) {
if(food.getId().equals(map.get("id"))) {
request.setAttribute("msg", "菜名已存在");
//菜名已存在，跳转到添加界面
request.getRequestDispatcher("/addFood.jsp").forward(request, response);
return;
}
}
}
//新添加的菜名可上传，封装相关数据
Food food=new Food();
food.setId(map.get("id"));
food.setName(map.get("foodName"));
food.setTaste(map.get("taste"));
food.setPath(url);
food.setPrice(map.get("price"));
food.setDescribe(map.get("description"));
if(FoodDaoImpl1==null) {
FoodDaoImpl1=new FoodDaoImpl();
//添加到全局对象FoodDaoImp1中
FoodDaoImpl1.addFood(food);
this.getServletContext().setAttribute("FoodDaoImpl1", FoodDaoImpl1);
//跳转到展示食物界面
request.getRequestDispatcher("/showFoodList.jsp").forward(request, response);
}
}
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
package com.imooc.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.imooc.domain.Food;
import com.imooc.domain.FoodDaoImpl;
/**
* Servlet implementation class FoodDeleteServlet
*/
public class FoodDeleteServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public FoodDeleteServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
FoodDaoImpl FoodDaoImpl1=(FoodDaoImpl) this.getServletContext().getAttribute("FoodImple1");
List<Food> foodList=FoodDaoImpl1.getDb();
String deleteFoodId=request.getParameter("id");
String msg=FoodDaoImpl1.getMsg();
boolean flag=false;
for(Food food:foodList) {
if(food.getId().equals(deleteFoodId)) {
flag=true;
}
if(flag==false) {
msg="输入的id不存在，请重新输入";
request.setAttribute("msg", msg);
}else {
FoodDaoImpl1.deleteFoodById(deleteFoodId);
this.getServletContext().setAttribute("FoodImpl1", FoodDaoImpl1);
msg="根据id删除菜品已完成";
request.setAttribute("msg", msg);
request.getRequestDispatcher("/showFoodList.jsp").forward(request, response);
}
}
}
}
package com.imooc.servlet;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.imooc.domain.Food;
import com.imooc.domain.FoodDaoImpl;
import com.imooc.util.UploadUtils;
/**
* Servlet implementation class FoodUpdateServlet
*/
public class FoodUpdateServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public FoodUpdateServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
FoodDaoImpl FoodDaoImpl1=(FoodDaoImpl) this.getServletContext().getAttribute("FoodDaoImpl");
List<Food> foodList=FoodDaoImpl1.getDb();
if(foodList.isEmpty()) {
System.out.println("从ServletContext中获得的list是空的");
}
Map<String,String> map=new HashMap<String,String>();
try {
//1创建磁盘拱辰享文件
DiskFileItemFactory diskFileItemFactory=new DiskFileItemFactory();
//2创建一个核心解析类
ServletFileUpload servletFileUpload=new ServletFileUpload(diskFileItemFactory);
//3解析request请求，返回的是List集合，List集合中存放的是FileItem对象
List<FileItem> list=servletFileUpload.parseRequest(request);
//4遍历List集合，判断FileItem类型
String url=null;
for(FileItem fileItem:list) {
if(fileItem.isFormField()) {
String name=fileItem.getName();
String value=fileItem.getString();
map.put(name, value);
}else {
String fileName=fileItem.getName();
if(fileName!=null&&!"".equals(fileName)) {
//通过工具类获取唯一文件名
String uuidFileName=UploadUtils.getUUIDFileName(fileName);
//获得文件上传的数据
InputStream is=fileItem.getInputStream();
//获得文件上传的路径
String path=this.getServletContext().getRealPath("/img");
url=path+"\\"+uuidFileName;
OutputStream os=new FileOutputStream(url);
int len=0;
byte[] b=new byte[1024];
while((len=is.read(b))!=-1) {
os.write(b,0,len);
}
is.close();
os.close();
}
}
}
//检验菜名
Iterator<Food> iterator=foodList.iterator();
boolean flag=false;
Food testFood=null;
while(iterator.hasNext()) {
testFood=iterator.next();
if(testFood.getId().equals(map.get("id"))) {
flag=true;
break;
}
}
if(flag==false) {
String msg="您要修改的id:"+map.get("id")+"菜单里没有";
request.setAttribute("msg", msg);
request.getRequestDispatcher("/updateFood.jsp").forward(request, response);
}else {
Food food=new Food();
food.setId(map.get("id"));
food.setName(map.get("name"));
food.setTaste(map.get("taste"));
food.setPath(url);
food.setPrice(map.get("price"));
food.setDescribe(map.get("describe"));
FoodDaoImpl1.updateFood(food);
System.out.println("更新后的food为"+food);
this.getServletContext().setAttribute("FoodDaoImpl1", FoodDaoImpl1);
request.getRequestDispatcher("/showFood.jsp").forward(request, response);
}
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
package com.imooc.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.imooc.domain.Food;
import com.imooc.domain.FoodDaoImpl;
/**
* 初始化Servlet implementation class InitServlet
*/
public class InitServlet extends HttpServlet {
@Override
public void init() throws ServletException {
//创建FoodDaoImpl对象
FoodDaoImpl FoodDaoImpl=new FoodDaoImpl();
//创建一个list集合用来接收DaoImpl中的list
List<Food> foodList=FoodDaoImpl.getDb();
//将初始化的FoodDaoImpl对象及其list表存放到ServletContext中
this.getServletContext().setAttribute("FoodDaoImpl1", FoodDaoImpl);
this.getServletContext().setAttribute("foodList", foodList);
}
}
package com.imooc.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.imooc.domain.Food;
import com.imooc.domain.FoodDaoImpl;
/**
* Servlet implementation class SelectServlet
*/
public class SelectServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public SelectServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
FoodDaoImpl FoodDaoImpl1=(FoodDaoImpl) this.getServletContext().getAttribute("FoodDaoImpl");
List<Food> list=FoodDaoImpl1.getDb();
String foodName=request.getParameter("foodName");
Food foodSearch=FoodDaoImpl1.getFoodByName(foodName);
boolean flag=false;
if(foodSearch!=null) {
flag=true;
}
if(flag==false) {
String msg="对不起，您要查找的"+foodName+"在我们家菜单没有";
request.setAttribute("msg", msg);
request.getRequestDispatcher("/selectFoodByName.jsp").forward(request, response);
}else {
request.getSession().setAttribute("foodSearch", foodSearch);
request.getRequestDispatcher("/showFoodByName.jsp").forward(request, response);
}
}
}
package com.imooc.util;
import java.util.UUID;
public class UploadUtils {
/**
* 生成唯一文件名
*/
public static String getUUIDFileName(String fileName) {
//将文件名前面部分进行截取
int idx=fileName.lastIndexOf(".");
String extention=fileName.substring(idx);
String uuidFileName=UUID.randomUUID().toString().replace("-", "")+extention;
return uuidFileName;
}
}
<%@ page contentType="text/html;charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<%
String basePath = request.getScheme() + "://" + request.getServerName() +
":" + request.getServerPort() + request.getContextPath();
%>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>添加菜品</title>
<style type="text/css">
</style>
</head>
<body>
<center>
<h1>菜品添加</h1>
<%
String msg="";
if(request.getAttribute("msg")!=null){
msg=(String)request.getAttribute("msg");
}
%>
<h2 style="color:green;font-weight:bolder;">${requestScope.msg }</h2>
<form action="<%=basePath%>/add" method="post" enctype="multipart/form-data">
<table border="1px" width="400px" cellspacing="0px" cellpadding="0px">
<tr>
<td>菜品 ID</td>
<td><input type="text" name="id"></td>
</tr>
<tr>
<td>菜 名</td>
<td><input type="text" name="foodName"></td>
</tr>
<tr>
<td>口 味</td>
<td>
<input type="radio" name="taste" value="香辣">香辣
<input type="radio" name="taste" value="微辣">微辣
<input type="radio" name="taste" value="麻辣">麻辣
<input type="radio" name="taste" value="不辣">不辣
</td>
</tr>
<tr>
<td>菜品图片</td>
<td><input type="file" name="foodImage"></td>
</tr>
<tr>
<td>价 格</td>
<td><input type="text" name="price"></td>
</tr>
<tr>
<td>菜品描述</td>
<td>
<textarea name="description"></textarea>
</td>
</tr>
<tr style="text-align:center;width:20px">
<td colspan="2">
<input type="submit" value="添加">
<input type="reset" value="重置">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
<%@ page contentType="text/html;charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<%
String menu=request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() +
":" + request.getServerPort() + request.getContextPath();
%>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜品删除(根据ID删)</title>
<style type="text/css">
</style>
</head>
<body>
<center>
<h1>菜品删除(根据ID删除)</h1>
<h2 style="color:red;font-weight:bolder;">${requestScope.msg}</h2>
<form action="<%=basePath%>/delete" method="post">
<table width="400px" border="1px" cellspacing="0px" cellpadding="0px">
<tr>
<td>菜品ID</td>
<td><input type="text" name="id"></td>
</tr>
<tr>
<td colspan="2" style="text-align:center"><input type="submit" value="删除"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
<%@ page contentType="text/html;charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<p><a href="addFood.html" target="main">菜品添加</a></p>
<p><a href="selectFood.html" target="main">菜品查询</a></p>
<p><a href="updateFood.html" target="main">菜品修改</a></p>
<p><a href="deleteById.html" target="main">菜品删除</a></p>
</body>
</html>
<%@ page contentType="text/html;charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<%
String basePath = request.getScheme() + "://" + request.getServerName() +
":" + request.getServerPort() + request.getContextPath();
%>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜品查询选项页面</title>
<style type="text/css">
</style>
</head>
<body>
<center>
<p><a href="/showFoodList.jsp">查询所有菜品信息</a></p>
<p><a href="/selectFoodByName.jsp">菜名查询</a></p>
</center>
</body>
</html>
<%@ page contentType="text/html;charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<%
String basePath = request.getScheme() + "://" + request.getServerName() +
":" + request.getServerPort() + request.getContextPath();
%>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜名查询</title>
<style type="text/css">
</style>
</head>
<body>
<center>
<h1>菜名查询</h1>
<%
String msg="";
if(request.getAttribute("msg")!=null){
msg=(String)request.getAttribute("msg");
}
%>
<form action="<%=basePath%>/select" method="post">
<input type="hidden" name="type" value="2">
<table width="400px" border="1px" cellspacing="0px" cellpadding="0px">
<tr>
<td>菜名</td>
<td><input type="text" name="foodName"></td>
</tr>
<tr>
<td colspan="2" style="text-align:center"><input type="submit" value="查询"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
<%@ page import=java.* %>
<%@ page contentType="text/html;charset=utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜品管理系统</title>
</head>
<frameset rows="20%,*">
<frame src="./top.html"></frame>
<frameset cols="10%,*">
<frame src="./left.html"></frame>
<frame name="main"></frame>
</frameset>
</frameset>
</html>
<%@ import=java.* %>
<%@ page contentType="text/html;charset=utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<%
String basePath = request.getScheme() + "://" + request.getServerName() +
":" + request.getServerPort() + request.getContextPath();
%>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜品信息展示</title>
<style type="text/css">
</style>
</head>
<body>
<center>
<h1>菜品查询</h1>
<table border="1px" cellspacing="0px" cellpadding="0px" width="800px">
<thead>
<tr>
<th>菜品ID</th>
<th>菜名</th>
<th>口味</th>
<th>菜品图片</th>
<th>价格</th>
<th>菜品描述</th>
</tr>
</thead>
<tbody>
<c:forEach items="${applicationScope.FoodDaoImpl1.getDb() }" var="food">
<tr>
<td>${food.Id }</td>
<td>${food.name }</td>
<td>${food.taste }</td>
<td><img src=${food.path}></td>
<td>${food.price }</td>
<td>${food.describe }</td>
</tr>
</c:forEach>
</tbody>
</table>
</center>
</body>
</html>
<%@ page contentType="text/html;charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<center>
<h1>菜品后台管理系统</h1>
</center>
</body>
</html>
<%@ page contentType="text/html;charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<%
String basePath = request.getScheme() + "://" + request.getServerName() +
":" + request.getServerPort() + request.getContextPath();
%>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜品修改(根据菜品ID进行修改)</title>
<style type="text/css">
</style>
</head>
<body>
<center>
<h1>根据菜品ID修改</h1>
<form action="<%=basePath%>/FoodUpdateServlet" method="post" enctype="multipart/form-data">
<table border="1px" width="400px" cellspacing="0px" cellpadding="0px">
<tr>
<td>修改ID</td>
<td><input type="text" name="id"></td>
</tr>
<tr>
<td>菜 名</td>
<td><input type="text" name="foodName"></td>
</tr>
<tr>
<td>口 味</td>
<td>
<input type="radio" name="taste" value="香辣">香辣
<input type="radio" name="taste" value="微辣">微辣
<input type="radio" name="taste" value="麻辣">麻辣
<input type="radio" name="taste" value="不辣">不辣
</td>
</tr>
<tr>
<td>菜品图片</td>
<td><input type="file" name="foodImage"></td>
</tr>
<tr>
<td>价 格</td>
<td><input type="text" name="price"></td>
</tr>
<tr>
<td>菜品描述</td>
<td>
<textarea name="description"></textarea>
</td>
</tr>
<tr style="text-align:center;width:20px">
<td colspan="2">
<input type="submit" value="修改">
<input type="reset" value="重置">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
麻烦帮我改好，谢谢4
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